Discussion: Regular Timer

This script syncs to the wall clock. If you set interval to N (which can be a float), the action() is called at N, 2*N, 3*N, etc. Other timers sync to time since reset or time since creation, this one does not. It also attempts to adjust itself if SL is slow (or fast .

Because it is sync'ed to the wall clock, several objects will act in unison, give or take a couple hundreths of a second.

//  Regular clock ticker.
//  Set interval to some number of seconds
//
//  Put a call to perfomr some actions in action().
//
//  Object will perform action() every interval seconds.  If there are more than
//  one, they will work in synch.
//
//   Lee Ponzu, no rights reserved


float interval = 3.0; //seconds between actions
float inv;
float acc = .01;

action()
{
    // put the action that should be performed here
    
    llSetRot( llGetRot()*llEuler2Rot(<0,0,PI_BY_TWO>) );
}

// Gets the number of milliseconds since midnight UTC.
// GetGMTmsclock() is by ...damn, can't find it.  Thanks though.

integer GetGMTmsclock()
{
    string stamp = llGetTimestamp();
    return
        (integer) llGetSubString(stamp, 11, 12) * 3600000 +
        (integer) llGetSubString(stamp, 14, 15) * 60000 +
        llRound((float) llGetSubString(stamp, 17, -2) * 1000.0);
}

float GetTime()
{
    return GetGMTmsclock()*.001;
}


default
{
    state_entry()
    {
        llOwnerSay( "entering default state");
        llSetTimerEvent(interval);
        inv=1.0/interval;
    }
    on_rez(integer n)
    {
        llOwnerSay("rezzing");
        //tick = llGetTime();
    }

    touch_start(integer total_number)
    {
        llSay(0, "Touched.");
        llSleep(10);
    }
    
    timer()
    {
        float now = GetTime();
        float count = now*inv;
        // invariant is for count to be close to an integer, and 
        // delta to be zero
        
        float delta = interval*(count - llRound(count));
        if(llFabs(delta) > acc)
                llSetTimerEvent( interval-delta );
        
        // this is where the action would go...

        action();
        
    }
}